So I live in Galveston, Tx and am currently going to school for Marine Biology with a minor in Scuba Diving. I originally downloaded this app to help me condition my breathing prior to any of my dive classes so I’d have a leg up on others in my classes when it came to free-diving. I took the initial test and started at 50 seconds, yet within 3 days of CO2 training I’d gone all the way to 2 minutes and 5 seconds. So in my opinion the app works great if you practice (I did it more frequently than the app recommended though)... I wanted to save the rest of my stuff in app so I decided to just pay for a year since it was cheap and I kinda liked the idea of a countdown since I hate looking at the timer... but the voice for the timer sounds awful and makes me uncomfortable! Not to mention I’d prefer more of a serious 10-15 second countdown going like 10-9-8-etc. than a whole minute of 10 second intervals. So since I’m still in the free trial I think I’ll just unsubscribe before the end of the trial and keep my own notes about my practices since the only things you can pay for aren’t even that great... That all being said, I 100% recommended this app! It is simple to use, easy to understand, and it does exactly what it’s meant to! I plan to use this for a long time indeed!

So this is simple enough you’d almost expect it to be free but:1) It is really easy and effective. In one week my breathold has gone from 60 seconds to 3 minutes. I can’t wait for my next snorkel trip, and expect to be a lot higher on breathhold by then2) yeah I could use a timer to do this but I wouldn’t in practice, so this rocks. I actually use if during my morning coffeee while surfing the news turning what used to be “wasted” time into a workout3) it’s like $11 a year… for something that if you use it will really tweak your autonomic nervous system 4) No ads / just clean easy uncluttered functionality5) it’s fun and easy to see your progress. An almost zen like feeling when you realize it’s been two minutes since your last breath and you are calm and present and have no need to breathePs. Bonus #6 Have started Buteyko Breathing during my runs and aerobics. It is crazy efficient. But it works by boosting CO2 blood gas, so you feel like you are drowning because your ANS is telling you to gasp air like a dying fish because even though you’ve got plenty of blood gas O2 your CO2 is high. This is really helping with that, so an $11 app is also boosting my running, all while I drink my morning coffee… pretty cool stuff!

Im not sure if this is normal or if it will be the same for every but i started off being able to hold my breath for 1:23. I then did one training session of each type (CO2 and O2). After that i decided to try another breath hold test and found that i was able to hold my breath for 2:46. I literally doubled my time in under an hour and I don’t know how that’s possible. I can now get to two+ minutes before feeling any slight discomfort and by the end of the month i'm hoping to be able to hold my breath for 3:30-4:15. I’m extremely impressed by this app and very glad that i tried it out.

To start the if you leave the app for any reason (e.I. Answer a text message) in the middle of the session when you return to the app it restarts the entire session.. also if you tap the stop/start button it does not momentarily pause the session it restarts, so would like there to at least be that. Also there is no way to customize times for your CO2 tables OR O2 tables you are stuck with whatever is given to you(far too basic, there are free apps that do this). The only way to manipulate times is to change your max breath hold. Ideally there would be a progression in the tables not static, this way it allows you to advance. Few other minor issues like crashes and general lack of info. But overall the other issues would make this a deal breaker.